linux-kernel - Re: [PATCH V3 0/8] ARM: cpuidle: Unify the ARM64/ARM DT approach

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Message-ID: <551031BB.4020200@linaro.org>
Date:	Mon, 23 Mar 2015 16:31:07 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"robherring2@...il.com" <robherring2@...il.com>,
	"arnd@...db.de" <arnd@...db.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"lina.iyer@...aro.org" <lina.iyer@...aro.org>,
	"sboyd@...eaurora.org" <sboyd@...eaurora.org>
Subject: Re: [PATCH V3 0/8] ARM: cpuidle: Unify the ARM64/ARM DT approach

On 03/23/2015 04:27 PM, Lorenzo Pieralisi wrote:
> On Fri, Mar 20, 2015 at 11:43:53AM +0000, Daniel Lezcano wrote:
>> There is a big number of cpuidle drivers for the ARM architecture.
>>
>> These drivers have been cleaned up and grouped into the drivers/cpuidle
>> directory to keep track of the changes more easily and ensure the code
>> is following the same scheme across the drivers.
>>
>> That had the benefit of simplifying the code and factor out a lot of common
>> parts. Beside that, as the drivers belong to the 'drivers' directory, we had
>> to split the arch specific bits and the generic code in order to keep
>> everything self contained. The platform driver paradigm was used for this
>> purpose.
>>
>> Unfortunately, this approach is now no longer accepted and a different solution
>> must be provided to reach the same goal: one example is the Qualcomm cpuidle
>> driver upstreaming attempt.
>>
>> In the meantime, ARM64 developed a generic cpuidle driver based on DT definition.
>>
>> The DT definition provides an 'enable-method' to specify one of the cpu
>> operations (PSCI, ...).
>>
>> This patchset unify this driver with ARM32, using the same DT definition.
>>
>> Thanks with this patchset we can use the 'enable-method' to specify a cpu
>> operations, hence get rid of the platform driver approach and go further in the
>> cpuidle driver flexibility via the DT.
>
> Tested on arm64 Juno and FVP models.

Thanks Lorenzo for testing the patches.

I applied the series to my tree for 4.1.

   -- Daniel

> Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
>
>>
>> Changelog:
>>
>>   V3:
>> 	* Fixed unroll loop when failing to register the device
>> 	* Removed the per cpu cpuidle_device
>> 	* Remove goto statement in the registration path
>> 	* Fixed a compilation failure with allyesconfig on arm64
>>
>>   V2:
>> 	* Used smp_operations style for cpuidle_ops
>> 	* Fixed some nits in the comments
>> 	* Added a patch to change the name of the functions
>> 	* Added per cpu device registration patch
>>
>> Daniel Lezcano (8):
>>    ARM: cpuidle: Remove duplicate header inclusion
>>    ARM: cpuidle: Add a cpuidle ops structure to be used for DT
>>    ARM64: cpuidle: Replace cpu_suspend by the common ARM/ARM64 function
>>    ARM64: cpuidle: Rename cpu_init_idle to a common function name
>>    ARM64: cpuidle: Remove arm64 reference
>>    ARM: cpuidle: Enable the ARM64 driver for both ARM32/ARM64
>>    ARM: cpuidle: Register per cpuidle device
>>    ARM: cpuidle: Change function name to be consistent with x86
>>
>>   arch/arm/include/asm/cpuidle.h                     | 23 +++++++
>>   arch/arm/kernel/cpuidle.c                          | 74 +++++++++++++++++++-
>>   arch/arm/mach-davinci/cpuidle.c                    |  1 -
>>   arch/arm/mach-imx/cpuidle-imx6q.c                  |  1 -
>>   arch/arm/mach-imx/cpuidle-imx6sl.c                 |  1 -
>>   arch/arm/mach-imx/cpuidle-imx6sx.c                 |  1 -
>>   arch/arm/mach-omap2/cpuidle44xx.c                  |  1 -
>>   arch/arm/mach-s3c64xx/cpuidle.c                    |  2 +-
>>   arch/arm/mach-tegra/cpuidle-tegra20.c              |  1 -
>>   arch/arm/mach-tegra/cpuidle-tegra30.c              |  1 -
>>   arch/arm64/include/asm/cpuidle.h                   |  9 ++-
>>   arch/arm64/kernel/cpuidle.c                        |  2 +-
>>   drivers/cpuidle/Kconfig                            |  7 +-
>>   drivers/cpuidle/Kconfig.arm                        | 12 +++-
>>   drivers/cpuidle/Kconfig.arm64                      | 13 ----
>>   drivers/cpuidle/Makefile                           |  5 +-
>>   drivers/cpuidle/{cpuidle-arm64.c => cpuidle-arm.c} | 80 ++++++++++++++++------
>>   drivers/cpuidle/cpuidle-at91.c                     |  1 -
>>   drivers/cpuidle/cpuidle-exynos.c                   |  1 -
>>   drivers/cpuidle/cpuidle-kirkwood.c                 |  1 -
>>   drivers/cpuidle/cpuidle-ux500.c                    |  1 -
>>   drivers/cpuidle/cpuidle-zynq.c                     |  1 -
>>   include/asm-generic/vmlinux.lds.h                  |  2 +
>>   23 files changed, 178 insertions(+), 63 deletions(-)
>>   delete mode 100644 drivers/cpuidle/Kconfig.arm64
>>   rename drivers/cpuidle/{cpuidle-arm64.c => cpuidle-arm.c} (57%)
>>
>> --
>> 1.9.1
>>
>>


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